Fed Decision in September?

Platform comparison

Market context

The real-world event driving this market is the Federal Open Market Committee’s September 2026 decision on the upper bound of the target federal funds rate, specifically the basis-point change versus the prior level. With the crowd-implied probability of a rate cut sitting at just 4%, the market currently anticipates the Fed will hold rates steady or potentially hike, rather than reduce them. This low probability reflects the hawkish tone adopted in recent meetings, where the Fed prioritised inflation control over short-term economic easing, even amid geopolitical uncertainty in the Middle East[1].

Historically, September FOMC meetings have been pivotal for rate adjustments, but the current 4% cut probability aligns with periods of persistent inflation where the Fed maintained a “wait-and-see” stance before acting later in the year. In Kevin Warsh’s first meeting as chair, the Fed held rates steady at 3.50%–3.75% but issued a hawkish statement that fully priced in an October hike, with a December hike also likely[1]. Programmatic traders should model this market by back-testing similar hawkish pivots in 2023–2024, where September cuts were rare until inflation data softened significantly.

Key catalysts to monitor include the August Jobs Report, the September CPI release, and the FOMC’s post-meeting statement on 28–29 September 2026. A recent analysis from Bloomberg confirms that futures markets are now pricing in an October hike, with any discussion of cuts deemed off the table until inflation trends downward[1]. Conditional order bots should be set to trigger on deviations in the 2-year Treasury yield, which rose 15 basis points following the last hawkish pivot, signalling heightened sensitivity to rate expectations[1]. Traders must also watch oil price movements, as falling prices could alter the Fed’s inflation outlook and shift the probability of a September cut.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Fed Decision in September? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Kalshi Fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.